Speaker



FIG. 1 is a front, right perspective view of the speaker;

FIG. 2 is a front, elevation view thereof;

FIG. 3 is a right side, elevation view thereof, the left side, elevation view being a mirror image thereof;

FIG. 4 is a rear elevation view thereof;

FIG. 5 is a top plan view thereof; and,

FIG. 6 is a bottom plan view thereof.

The broken lines showing an exemplar stand, driver openings, control openings and vent are for illustrative purposes only and form no part of the claimed design. 

The ornamental design for a speaker, as shown and described. 